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#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int v[16001];
int main()
{
int n,k,i,st=-1,dr=0,mij=0,sol=-1;
fin>>n>>k;
for(i=1;i<=n;i++){
fin>>v[i];
if(v[i]>st)
st=v[i];
dr+=v[i];
}
while(st<=dr){
mij=(st+dr)/2;
i=1;
int s=0,kf;
for(i=1;i<=n;i++){
s+=v[i];
if(s>mij){
s=v[i];
kf++;
}
}
if(kf<=k){
dr=mij;
sol=mij;
}
else{
st=mij+1;
}
}
fout<<sol;
return 0;
}